22656181 has 2 divisors, whose sum is σ = 22656182. Its totient is φ = 22656180.

The previous prime is 22656157. The next prime is 22656203. The reversal of 22656181 is 18165622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22648081 + 8100 = 4759^2 + 90^2 .

It is a cyclic number.

It is not a de Polignac number, because 22656181 - 2¹⁷ = 22525109 is a prime.

It is a super-2 number, since 2×22656181² = 1026605075009522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22636181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11328090 + 11328091.

It is an arithmetic number, because the mean of its divisors is an integer number (11328091).

Almost surely, 2^22656181 is an apocalyptic number.

It is an amenable number.

22656181 is a deficient number, since it is larger than the sum of its proper divisors (1).

22656181 is an equidigital number, since it uses as much as digits as its factorization.

22656181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 31.

The square root of 22656181 is about 4759.8509430443. The cubic root of 22656181 is about 282.9625117344.

The spelling of 22656181 in words is "twenty-two million, six hundred fifty-six thousand, one hundred eighty-one".